maintainers: remove QoS and pipeline repositories

maintainers: remove QoS and pipeline repositories

The git trees dpdk-next-qos and dpdk-next-pipeline were created
to share the load of patches merging.
It has been decided in the Technical Board that the load is not big
enough to justify keeping these repositories.

The patches for ethdev TM and MTR will be managed in dpdk-next-net.
The sched and meter libraries will be managed in the main tree.
The packet framework will be managed in the main tree as well.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>